The collapse of the very top of the dome is a common “disease” amongst sun helmets made from that light material, pith. In this respect, it does not matter, if a particular helmet had had an adventurous life or was never taken out of his transport tin.  The damage described above is often due to a weak point in the construction.  This article shows a way to repair or at least stabilize a damaged helmet – before it gets completely “puzzled” – by using techniques borrowed from bookbinding. Continue reading →